Improvement in stereoscopes



UNITED vSTATESl PATENT OFFICE.

MARY A. E. WHITNER, OF'PHILADELPHIA, PENNSYLVANIA.

IMPROVEMENT IN STEREOSCOPES.

Specification forming part of Letters Patent No. 158,555, dated January 5, 1875; application tiled December 9, 1874.

To all whom it may concern:

Beit known that I, Mrs. MARY A. E. WHIT- NER, of Philadelphia, Pennsylvania,'have invented certain Improvements in Stereoscopes, of which the following is a specification:

The main object of my invention is to pro vide a stereoscopic instrument with a holder, adapted for the reception, retention, removal, and replacing of a' seriesof pictures, in the manner which I will now proceed to describe, reference being had to the accompanying drawing, in which- Figure 1 is a perspective View of the instrument, and Fig. 2 a side View.

A represents a case containing a pair of ordinary stercoscope-lenses mounted on a frame,

B, which is arranged to slide in a recess formed in the under side of atransverse bar, D. The frame B is retained in any position to which it may be adjusted by a spring, x, on the said bar, which is attached to a plate, a, pivoted to a suitable stand, F, in a manner too clearly shown to need an extended description. lo the bar D are attached two frames, E, each of which is, in the presentv instance, formed of a single wire, bent in the manner shown, and has an inclined portion, el, on which the edges of the pictures rest, a vertical or slightly-inclined portion, e, and a backwardly-curved termination, f, for a purpose explained hereatter. To each end of the -bar D, or to each frame, or to both bar and frame, is attached a guard, H, consisting, in the present instance, ot` a single wire, the two guards being somewhat farther apart than a stereoscopic picture is long. The cross-bar D, frames E E, and guards H H constitute the picture-holder, in which a mass of stereoscopic cards are deposited, the front card of the series being permitted, by the terminations i of the frames E, to rest with its lower edge von the level surface of the said cross-bar D. Y

After the front picture has been viewed through the lenses, it may be raised from the holder, and replaced therein at the rea-r of the series, and this may be continued until the whole of the pictures have been viewed. This reintroduction of a picture into the holder at the back of the series is facilitated by the rounded rea-rs of the frames E, and the forward movement ot' the series of cards, consequent upon the introduction of a card at the rear of the holder, is facilitated by the inclined portions d of the frames.

The front picture of the series is always maintained by the guards H and cross-bar D in a proper position to be viewed through the lenses.

Io the under side of thecross-bar D is secured a plate, a, which is so hinged to the slotted top of a suitable stand, F, that both the lens-case and picture-holder can be read- 2. The frames E, inclined at el, and rounded at j', as'and for the purpose set forth.

In testimony whereof I have signed my name to this specification inthe presence of two subscribing witnesses.

MRS. MARY A. E. VVHITNER.

Witnesses HUBERT HowsoN, HARRY SMITH. 

